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Employee Benefit Plans - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Defined Benefit Plan Disclosure [Line Items] |
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| Options assumed |
102,586 |
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| Percentage of savings of salary income on a pre-tax or after-tax basis |
15.00% |
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| Matching employer contribution percentage |
50.00% |
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| Employer contribution deferred by eligible participants percentage |
3.00% |
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| Matching contribution expense recognized |
$ 119,000 |
$ 142,000 |
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| Discretionary contribution expense |
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80,000 |
| 2011 Equity Incentive Plan [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Total shares reserved for possible issuance |
500,000 |
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| Issuance of stock option |
0 |
0 |
0 |
| Options outstanding, weighted average remaining contractual life |
6 years |
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| Options exercisable, weighted average remaining contractual life |
6 years |
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| Unrecognized compensation expense |
0 |
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| Compensation expense related to stock options recognized |
0 |
0 |
0 |
| 2011 Equity Incentive Plan [Member] | Performance Shares [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Unrecognized compensation expense |
756,000 |
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| Compensation expense related to stock options recognized |
$ 358,000 |
$ 293,000 |
$ 112,000 |
| Share awards vesting period |
5 years |
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| 2011 Equity Incentive Plan [Member] | United Group Banking Company of Florida [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Options assumed |
102,586 |
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